CA1063524A - Filter assembly with modulating bypass valve - Google Patents
Filter assembly with modulating bypass valveInfo
- Publication number
- CA1063524A CA1063524A CA250,663A CA250663A CA1063524A CA 1063524 A CA1063524 A CA 1063524A CA 250663 A CA250663 A CA 250663A CA 1063524 A CA1063524 A CA 1063524A
- Authority
- CA
- Canada
- Prior art keywords
- spool
- bypass valve
- filter assembly
- cover
- valve means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 230000002028 premature Effects 0.000 claims abstract description 5
- 230000010349 pulsation Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000006854 communication Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 230000006872 improvement Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000002674 ointment Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/06—Filters making use of electricity or magnetism
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/147—Bypass or safety valves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/157—Flow control valves: Damping or calibrated passages
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Details Of Valves (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Filtration Of Liquid (AREA)
Abstract
FILTER ASSEMBLY WITH MODULATING BYPASS VALVE
A B S T R A C T
A filter assembly comprises a housing having a tubular filter and a bypass valve mounted therein. The valve comprises a spool having pressure modulating means thereon in the form of a tubular extension having a plurality of metering orifices formed therethrough. In normal operation, fluid is communicated from an inlet of the housing, through the filter and to an outlet. When the inlet pressure of the fluid exceeds a predetermined level due to clogging of the filter, for example, the fluid is communicated from the inlet to the outlet directly, through the metering orifices of the valve. The spool has a cylindrical portion which forms a sliding seal with a cylindrical bore defined in the housing to prevent premature opening of the bypass valve.
A B S T R A C T
A filter assembly comprises a housing having a tubular filter and a bypass valve mounted therein. The valve comprises a spool having pressure modulating means thereon in the form of a tubular extension having a plurality of metering orifices formed therethrough. In normal operation, fluid is communicated from an inlet of the housing, through the filter and to an outlet. When the inlet pressure of the fluid exceeds a predetermined level due to clogging of the filter, for example, the fluid is communicated from the inlet to the outlet directly, through the metering orifices of the valve. The spool has a cylindrical portion which forms a sliding seal with a cylindrical bore defined in the housing to prevent premature opening of the bypass valve.
Description
35'~
A conventional filter assembly for filtering-out contaminants from a lubricating or working fluid normally comprises a stationary housing hav-ing an annular cartridge-type filter removably mounted therein. A bypass valve of the poppet-type is normally mounted in the filter assembly to open and communicate fluid from the inlet to the outlet thereof directly, when the filter becomes clogged, for example.
One disadvantage of such filter assemblies is their inability to modulate fluid pressure in the system upon opening of the bypass valve. In addition, the poppet valves thereof are highly sensitive to pressure pulsat-ions and thus function as a "shock absorber" to open even during normalfiltering operations. An opening of only one-sixteenth of an inch, for example, will bypass unfiltered oil through the system.
In accordance with one aspect of the invention, there is provided in a filter assembly of the type co~prising a housing having an inlet and an outlet, a filter mounted in said housing, and bypass valve means vable between a closed position for sequentially permitting communication of fluld from said inlet, through said filter and to said outlet and an open position for sequentially communicating fluid from said inlet, through a port of said bypass valve means and to said outlet, the improvement wherein said bypass valve means comprises a reciprocally mounted spool normally main-tained in a closed position blocking said port and pressure modulating means comprising a tubular extension on said spool and having a plurality of meter-ing orifices formed therethrough for simultaneous movement therewith for modulating the pressure of said fluid through said bypass valve means upon opening thereof by ~etering fluid through said port to control differential fluid pressures prevalent on downstream and upstream sides thereof.
In accordance with another aspect of the invention there is provided in a filter assembly of the type comprising a housing having an inlet and an outlet, a filter mounted in said housing and bypass valve means movable between a closed position for sequentially permitting communication of fluid from said inlet, through said filter and to said outlet and an open position for sequentially comm~nicating fluid from said inlet, through a ~ -2- ' 106;~5'~4 .
port of said bypass valve r.~eans and to said outlet, the im~r~vement wherein said bypass valve means co~prises a cylindrical spool nornally maintained in a closed position blocking said port and having a cylindrical portion thereof closely fitted for reciprocation in a cylindrical bore defined in said housing to define said port and to further define a sliding seal there-at nornally closing said bypass valve means for preventing premature opening thereof when said bypass valve means is subjected to pressure pulsations and a tubular extension on said spool having a plurality of metering orifices formed therethrough to comprise said bypass valve means and to receive fluid from said inlet directly.
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~rief Descri~tion of the r~rawin~r Other objects of this inventioII will become ap~arent : from the ~ollowing description and accompanying clrawin~ wherein:
~'IG. 1 schematically illustrates the ~ilter assembly of this invention integrated into a fluid circuit, '' FIG. 2 is an enlarged longitudinal sectional view of the filter assembly; and ; FIG. 3 is an enlarged ~ragmentary view of a sliding seal employed in a bypass valve of the filter assernbly.
Detailed Descriptlon FIG. 1 illustrates a tank 10 for retaining a lubricating or working fluid F, such as oil, in a storage charnber thereof. A
stationary housing 11 is secured within the tank and has a filter assembly 12 (FIG. 2) removably mounted thereirl. In normal operation, a pump 13 draws fluid from the tank and purnps it through a first conduit 14 for use in a work system 15, such as a lubricating circuit for an engine, a working circuit for hydraulic cylinders, or the like. The fluid is returned to an inlet 16 of the filter assembly, formed on an underside of housing 11 (FIG. 2), via a second conduit 17. The fluid then passes ,' upwardly through the filter assembly and through an outlet 18 of the housing whereby it i5 returned to tank 10 via an outlet concluit 19.
Referring to FIG. 2, the filter assernbly comprises an annular cover member 20 having a radial ~lange 21 detachably mounted on tank 10 to form part of housing 11, by a,plurality :' of circumferentially disposed cap screws 22. The cover defines a pair o~ chambers 23 and 24 therein which are normally - ., , ... . . . .
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blocked by a bypass valve means 25. The valve means comprises a cyllndrical spool 26 reciprocally mounted in a bore 27 formed - in the cover and a compression coil spring or spring means 28, disposed between the spool and the cover to normally bias the spool upwardly to its closed position.
rrhe spool comprises pressure modulating means 29 secured on an upper end thereof for meterin~ fluid flow past - an annular control port or cylindrical bore 30 formed in the cover of the housing. ~he modulating means comprises a tubular extension 31 of the spool having a plurality of metering orlfices 32 formed therethrough. The spool further comprises an annular closed wall 33 secured therein between the ends ; thereof with the extension being secured to an upper side of the wall and a cylindrical portion 34 of the spool being secured to an underside of the wall.
l~eferring to FI~. 3, it should be noted that outer cylindrlcal portions of spool 26, defined by an axial dimenslon S, are closely fitted withln cylindrical bore 30 to define a sliding seal thereat normally closing the bypass valve. As mentioned above, a conventional poppet valve is sensitive to pressure pulsations in a lubricating system and will tend to open even during normal operations when all of the oil is intended to pass through the filter. Althougil the slidlng seal defined at S will also be sub~ected to a l'shock absorbingll . : _ ~unction resulting from pressure fluctuations during normal filtering operations, a sufficiently long sealing area is provided thereat to prevent premature opening of the bypass valve.
",~
' ~06;~524 The upper end of extension 31 further functions as a stop means on the spool normally engaging a large pan bolt 35, forming part of the cover, to hold the spool in its closed position and to precisely define axial dimension S of the sliding seal ~Fig. 3). Bolt 35 is axially aligned with the spool and is threadably mounted in a threaded aperture 36 formed through the cover to provide means removably mounted thereon to solely expose the bypass valve means. Threaded aperture 36 has an inside diameter slightly larger than the outside dlameter of spool 26 to facilitate removal of the spool through the cover member.
The filter assembly further comprises an annular support member 37 releasably attached to the cover member in axially spaced relationship therewith by an elongated bolt 38. A cyllndrical screen 39 has its lower end welded to the support member and a cylindrical sealing gasket 40 is secured ; to the upper end of the screen and is slidably mounted withln an annular recess 41 formed in the cover. A tubular cartridge-type filter 42 is disposed within the screen and is secured .;'1 i 20 in place between the cover and the support member by bolt 38.
The outer periphery of the filter is positioned radially inwardly from screen 39 to define an annular passage ' 43 therebetween. Likewise, the screen is disposed radially . ~ inwardly from housing 11 to define an annular chamber 44 therebetween communicating directly with inlet 16. Magnet ;! means, preferably in the form of a plurality of bar magnets 45, are disposed on an underside of the support member in axial opposition to the inlet and are held in place thereon by a .~
j 30 '"';''' ;- -5-.. . . .. -. .... , ~ , .. . .. .. . . . .. .
1(3635Z4 , ,. . ~,, retainer 46. The retainer is held in place by bolt 38 and a ~; , washer 47 and is suitably stamped to define a plurality of radially outwardly extending and circumferentially disposed pockets 48, each retaining a bar magnet therein.
, , 5 In operation, fluid normally flows from inlet 16 and through annular chamber 44, screen 39, passage 43, filter 42 ;, and chamber 24. The latter chamber communicates with outlet l 18 to return the fluid to tank 10 (FIG. 1) with the sliding , ,, ~ seal defined at S (FIG. 3) functioning to compensate for ,;: .
pressure pulsations occurring in the system to prevent premature ;
opening of the bypass valve. Bar magnets 45 will function to -substantially uniformly disperse the fluid radially outwardly ., ~ ................................................................... . .
~ to annular chamber 44, whereby uniform filtering ls achieved.
r:: In addition, the magnets will function to pick-up metalllc particles contained in the fluid flowing thereover.
~ When the fluid pressure in chamber 44, passage 113 5~ ; and charnber 23 exceeds a predetermined level, such as when ~ilter 42 becomes clogged, bypass valve means 25 will open.
~ ~l Orifices 32 of the pressure modulating means will function to ''~ 20 precisely meter fluid flow past control port 30 and into chamber ~,! 24 and outlet 18. The pressure modulating means will thus , prevent undue pressure surges and fluctuations in the system due to its precisely calibrated control of the differential . ,; . ....
~; pressures prevalent on the downstream and upstream sides of the bypass valve means.
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A conventional filter assembly for filtering-out contaminants from a lubricating or working fluid normally comprises a stationary housing hav-ing an annular cartridge-type filter removably mounted therein. A bypass valve of the poppet-type is normally mounted in the filter assembly to open and communicate fluid from the inlet to the outlet thereof directly, when the filter becomes clogged, for example.
One disadvantage of such filter assemblies is their inability to modulate fluid pressure in the system upon opening of the bypass valve. In addition, the poppet valves thereof are highly sensitive to pressure pulsat-ions and thus function as a "shock absorber" to open even during normalfiltering operations. An opening of only one-sixteenth of an inch, for example, will bypass unfiltered oil through the system.
In accordance with one aspect of the invention, there is provided in a filter assembly of the type co~prising a housing having an inlet and an outlet, a filter mounted in said housing, and bypass valve means vable between a closed position for sequentially permitting communication of fluld from said inlet, through said filter and to said outlet and an open position for sequentially communicating fluid from said inlet, through a port of said bypass valve means and to said outlet, the improvement wherein said bypass valve means comprises a reciprocally mounted spool normally main-tained in a closed position blocking said port and pressure modulating means comprising a tubular extension on said spool and having a plurality of meter-ing orifices formed therethrough for simultaneous movement therewith for modulating the pressure of said fluid through said bypass valve means upon opening thereof by ~etering fluid through said port to control differential fluid pressures prevalent on downstream and upstream sides thereof.
In accordance with another aspect of the invention there is provided in a filter assembly of the type comprising a housing having an inlet and an outlet, a filter mounted in said housing and bypass valve means movable between a closed position for sequentially permitting communication of fluid from said inlet, through said filter and to said outlet and an open position for sequentially comm~nicating fluid from said inlet, through a ~ -2- ' 106;~5'~4 .
port of said bypass valve r.~eans and to said outlet, the im~r~vement wherein said bypass valve means co~prises a cylindrical spool nornally maintained in a closed position blocking said port and having a cylindrical portion thereof closely fitted for reciprocation in a cylindrical bore defined in said housing to define said port and to further define a sliding seal there-at nornally closing said bypass valve means for preventing premature opening thereof when said bypass valve means is subjected to pressure pulsations and a tubular extension on said spool having a plurality of metering orifices formed therethrough to comprise said bypass valve means and to receive fluid from said inlet directly.
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' . :, , .
~'~'c . .
. ., I .
. . ~
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.
-, . . . .
S'~
~.
~rief Descri~tion of the r~rawin~r Other objects of this inventioII will become ap~arent : from the ~ollowing description and accompanying clrawin~ wherein:
~'IG. 1 schematically illustrates the ~ilter assembly of this invention integrated into a fluid circuit, '' FIG. 2 is an enlarged longitudinal sectional view of the filter assembly; and ; FIG. 3 is an enlarged ~ragmentary view of a sliding seal employed in a bypass valve of the filter assernbly.
Detailed Descriptlon FIG. 1 illustrates a tank 10 for retaining a lubricating or working fluid F, such as oil, in a storage charnber thereof. A
stationary housing 11 is secured within the tank and has a filter assembly 12 (FIG. 2) removably mounted thereirl. In normal operation, a pump 13 draws fluid from the tank and purnps it through a first conduit 14 for use in a work system 15, such as a lubricating circuit for an engine, a working circuit for hydraulic cylinders, or the like. The fluid is returned to an inlet 16 of the filter assembly, formed on an underside of housing 11 (FIG. 2), via a second conduit 17. The fluid then passes ,' upwardly through the filter assembly and through an outlet 18 of the housing whereby it i5 returned to tank 10 via an outlet concluit 19.
Referring to FIG. 2, the filter assernbly comprises an annular cover member 20 having a radial ~lange 21 detachably mounted on tank 10 to form part of housing 11, by a,plurality :' of circumferentially disposed cap screws 22. The cover defines a pair o~ chambers 23 and 24 therein which are normally - ., , ... . . . .
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blocked by a bypass valve means 25. The valve means comprises a cyllndrical spool 26 reciprocally mounted in a bore 27 formed - in the cover and a compression coil spring or spring means 28, disposed between the spool and the cover to normally bias the spool upwardly to its closed position.
rrhe spool comprises pressure modulating means 29 secured on an upper end thereof for meterin~ fluid flow past - an annular control port or cylindrical bore 30 formed in the cover of the housing. ~he modulating means comprises a tubular extension 31 of the spool having a plurality of metering orlfices 32 formed therethrough. The spool further comprises an annular closed wall 33 secured therein between the ends ; thereof with the extension being secured to an upper side of the wall and a cylindrical portion 34 of the spool being secured to an underside of the wall.
l~eferring to FI~. 3, it should be noted that outer cylindrlcal portions of spool 26, defined by an axial dimenslon S, are closely fitted withln cylindrical bore 30 to define a sliding seal thereat normally closing the bypass valve. As mentioned above, a conventional poppet valve is sensitive to pressure pulsations in a lubricating system and will tend to open even during normal operations when all of the oil is intended to pass through the filter. Althougil the slidlng seal defined at S will also be sub~ected to a l'shock absorbingll . : _ ~unction resulting from pressure fluctuations during normal filtering operations, a sufficiently long sealing area is provided thereat to prevent premature opening of the bypass valve.
",~
' ~06;~524 The upper end of extension 31 further functions as a stop means on the spool normally engaging a large pan bolt 35, forming part of the cover, to hold the spool in its closed position and to precisely define axial dimension S of the sliding seal ~Fig. 3). Bolt 35 is axially aligned with the spool and is threadably mounted in a threaded aperture 36 formed through the cover to provide means removably mounted thereon to solely expose the bypass valve means. Threaded aperture 36 has an inside diameter slightly larger than the outside dlameter of spool 26 to facilitate removal of the spool through the cover member.
The filter assembly further comprises an annular support member 37 releasably attached to the cover member in axially spaced relationship therewith by an elongated bolt 38. A cyllndrical screen 39 has its lower end welded to the support member and a cylindrical sealing gasket 40 is secured ; to the upper end of the screen and is slidably mounted withln an annular recess 41 formed in the cover. A tubular cartridge-type filter 42 is disposed within the screen and is secured .;'1 i 20 in place between the cover and the support member by bolt 38.
The outer periphery of the filter is positioned radially inwardly from screen 39 to define an annular passage ' 43 therebetween. Likewise, the screen is disposed radially . ~ inwardly from housing 11 to define an annular chamber 44 therebetween communicating directly with inlet 16. Magnet ;! means, preferably in the form of a plurality of bar magnets 45, are disposed on an underside of the support member in axial opposition to the inlet and are held in place thereon by a .~
j 30 '"';''' ;- -5-.. . . .. -. .... , ~ , .. . .. .. . . . .. .
1(3635Z4 , ,. . ~,, retainer 46. The retainer is held in place by bolt 38 and a ~; , washer 47 and is suitably stamped to define a plurality of radially outwardly extending and circumferentially disposed pockets 48, each retaining a bar magnet therein.
, , 5 In operation, fluid normally flows from inlet 16 and through annular chamber 44, screen 39, passage 43, filter 42 ;, and chamber 24. The latter chamber communicates with outlet l 18 to return the fluid to tank 10 (FIG. 1) with the sliding , ,, ~ seal defined at S (FIG. 3) functioning to compensate for ,;: .
pressure pulsations occurring in the system to prevent premature ;
opening of the bypass valve. Bar magnets 45 will function to -substantially uniformly disperse the fluid radially outwardly ., ~ ................................................................... . .
~ to annular chamber 44, whereby uniform filtering ls achieved.
r:: In addition, the magnets will function to pick-up metalllc particles contained in the fluid flowing thereover.
~ When the fluid pressure in chamber 44, passage 113 5~ ; and charnber 23 exceeds a predetermined level, such as when ~ilter 42 becomes clogged, bypass valve means 25 will open.
~ ~l Orifices 32 of the pressure modulating means will function to ''~ 20 precisely meter fluid flow past control port 30 and into chamber ~,! 24 and outlet 18. The pressure modulating means will thus , prevent undue pressure surges and fluctuations in the system due to its precisely calibrated control of the differential . ,; . ....
~; pressures prevalent on the downstream and upstream sides of the bypass valve means.
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Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a filter assembly of the type comprising a housing having an inlet and an outlet, a filter mounted in said housing, and bypass valve means movable between a closed position for sequentially permitting communi-cation of fluid from said inlet, through said filter and to said outlet and an open position for sequentially communicating fluid from said inlet, through a port of said bypass valve means and to said outlet, the improve-ment wherein said bypass valve means comprises a reciprocally mounted spool normally maintained in a closed position blocking said port and pressure modulating means comprising a tubular extension on said spool and having a plurality of metering orifices formed therethrough for simultaneous movement therewith for modulating the pressure of said fluid through said bypass valve means upon opening thereof by metering fluid through said port to control differential fluid pressures prevalent on downstream and upstream sides thereof.
2. The filter assembly of claim 1 wherein said plurality of metering orifices are disposed in circumferentially and axially spaced relationship relative to each other on the tubular extension of said spool.
3. The filter assembly of claim 2 wherein said spool is cylindrical and is reciprocally mounted in said port and further comprises a closed wall secured therein between ends thereof, said extension secured on a first side of said wall and a cylindrical portion of said spool secured to a second side of said wall.
4. The filter assembly of claim 2 further comprising a cover detach-ably mounted on said housing, a support member attached to said cover in axially spaced relationship therefrom, a tubular screen disposed axially between said cover and said support member and further disposed radially inwardly from said housing to define an annular chamber there-between communicating directly with said inlet, said filter being tubular and disposed within said screen and positioned radially inwardly therefrom to define an annular passage therebetween.
5. The filter assembly of claim 4 wherein said bypass valve means is solely removably mounted in said cover and a single bolt means is removably mounted on said cover for exposing the spool of said bypass valve means for per-mitting removal thereof through said cover.
6. The filter assembly of claim 5 wherein said spool is reciprocally mounted in a bore formed in said cover and is disposed in axial alignment with said bolt means and has an outside diameter which is at least slightly less than the inside diameter of a threaded aperture formed through said cover to threadably receive said bolt means therein.
7. The filter assembly of claim 6 wherein an upper end of the extension of said spool normally engages said bolt means to hold said spool in a closed position and wherein said bypass valve means further comprises spring means disposed between said housing and said spool for biasing said spool towards said bolt means.
8. The filter assembly of claim 4 wherein said cover and said support member are attached together by an elongated bolt threadably mounted to said cover.
9. The filter assembly of claim 4 further com-prising magnet means attached on an underside of said support member and disposed closely adjacent to said inlet.
10. The filter assembly of claim 9 wherein said magnet means comprises a plurality of bar magnets disposed to extend radially outwardly on said sup-port member and spaced circumferentially therearound and further comprising an annular retainer attached to a bottom side of said support member and defining a plurality of radially disposed pockets therein, one of said bar magnets retained in each of said pockets.
11. In a filter assembly of the type comprising a housing having an inlet and an outlet, a filter mounted in said housing and bypass valve means movable between a closed position for sequentially permitting communication of fluid from said inlet, through said filter and to said outlet and an open position for sequentially communicating fluid from said inlet, through a port of said bypass valve means and to said outlet, the improvement wherein said bypass valve means comprises a cylindrical spool normally maintained in a closed position blocking said port and having a cylindrical portion thereof closely fitted for reciprocation in a cylindrical bore defined in said housing to define said port and to further define a sliding seal thereat normally closing said bypass valve means for preventing premature opening thereof when said bypass valve means is subjected to pressure pulsations and a tubular extension on said spool having a plurality of metering orifices formed therethrough to comprise said bypass valve means and to receive fluid from said inlet directly.
12. The filter assembly of claim 11 wherein said spool further comprises a closed wall secured therein between ends thereof, said extension secured on a first side of said wall and a cylindrical portion of said spool secured to a second side of said wall.
13. The filter assembly of claim 11 further com-prising a cover detachably mounted on said housing and wherein said bypass valve means is solely removably mounted in said cover and a bolt means is removably mounted on said cover for exposing the spool of said bypass valve means for permitting removal thereof through said cover.
14. The filter assembly of claim 13 wherein said spool is reciprocally mounted in a bore formed in said cover and is disposed in axial alignment with said bolt means and has an outside diameter which is at least slightly less than the inside diameter of a threaded aperture formed through said cover to threadably receive said bolt means therein.
15. The filter assembly of claim 14 wherein an upper end of the extension of said spool normally engages said bolt means to hold said spool in a closed position to define an axial dimension of said sliding seal and wherein said bypass valve means further comprises spring means disposed between said housing and said spool for biasing said spool towards said bolt means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/612,157 US4053410A (en) | 1975-09-10 | 1975-09-10 | Filter assembly with modulating bypass valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1063524A true CA1063524A (en) | 1979-10-02 |
Family
ID=24451963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA250,663A Expired CA1063524A (en) | 1975-09-10 | 1976-04-21 | Filter assembly with modulating bypass valve |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4053410A (en) |
| BE (1) | BE845364A (en) |
| CA (1) | CA1063524A (en) |
| GB (1) | GB1497851A (en) |
| HK (1) | HK17183A (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55111814A (en) * | 1979-01-10 | 1980-08-28 | Garritty Lawrence Keith | Improved filteter for oil and or fuel |
| US4689144A (en) * | 1984-03-27 | 1987-08-25 | Australian Pacific Marketing Pty. Ltd. | Disposable filter unit for automatic transmission fluid |
| AT384600B (en) * | 1985-03-29 | 1987-12-10 | Mach Guido | METHOD FOR TREATING DRINKING AND / OR WATER WATER AND DEVICE FOR CARRYING OUT THE METHOD |
| US4721563A (en) * | 1986-09-11 | 1988-01-26 | Rosaen Borje O | Fluid filtering device |
| US5382355A (en) * | 1994-01-04 | 1995-01-17 | Arlozynski; Daniel A. | Engine coolant filter |
| US6139737A (en) * | 1998-09-04 | 2000-10-31 | Spx Corporation | Transmission fluid filter having a ferrite-filled nylon magnetic body |
| GB2361441A (en) * | 2000-04-19 | 2001-10-24 | Eclipse Magnetics Ltd | Magnetic filter in association with a porous filter |
| US6858134B2 (en) * | 2002-12-23 | 2005-02-22 | Arvin Technologies, Inc. | Fluid filtration system including replaceable filter module |
| US20050133451A1 (en) * | 2003-12-23 | 2005-06-23 | Ntz Nederland Bv | A full-flow microfiltration device and method for filtering fluids |
| US7390419B2 (en) * | 2005-02-17 | 2008-06-24 | Con-Serv Manufacturing | Waste water recovery system |
| US7967980B2 (en) * | 2006-11-17 | 2011-06-28 | Kobelco Construction Machinery Co., Ltd. | Construction machine having working oil tank with filter case |
| US20090283532A1 (en) * | 2008-05-15 | 2009-11-19 | Graco Minnesota Inc. | Integrated filter housing |
| US9303604B2 (en) | 2014-01-14 | 2016-04-05 | Caterpillar Inc. | Asymmetrical orifice for bypass control |
| CN103867537B (en) * | 2014-03-20 | 2016-08-17 | 上海朗境流体技术有限公司 | Return filter and the method filtering fluid thereof |
| CN105298994B (en) * | 2014-06-11 | 2017-06-16 | 上海朗境流体技术有限公司 | A kind of method of improved return filter and its filtering fluid |
| CN108591563A (en) * | 2018-05-30 | 2018-09-28 | 江苏安普阀门机械有限公司 | A kind of valve body of filter |
| EP3907397B1 (en) | 2020-03-30 | 2023-06-07 | Hamilton Sundstrand Corporation | Fuel filter assembly |
| EP3904667A1 (en) | 2020-04-28 | 2021-11-03 | Hamilton Sundstrand Corporation | Fuel filter assembly |
| EP4091693A1 (en) * | 2021-05-21 | 2022-11-23 | Hamilton Sundstrand Corporation | Filter valve assembly |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1802897A (en) * | 1926-09-27 | 1931-04-28 | Jesse N Holden | Throttle valve |
| FR697949A (en) * | 1929-09-27 | 1931-01-23 | Ets Tecalemit Sa | Further development of oil filters |
| US2056756A (en) * | 1935-06-17 | 1936-10-06 | Irving R Heinzel | Oil filtering device |
| US2406308A (en) * | 1942-09-17 | 1946-08-20 | Vokes Ltd | Filter |
| US2575995A (en) * | 1946-06-10 | 1951-11-20 | Briggs Filtration Company | By-pass filter |
| US2589920A (en) * | 1947-12-13 | 1952-03-18 | Kralinator Products Ltd | Oil filter |
| GB666983A (en) * | 1948-09-29 | 1952-02-20 | Stephens Barker & Company Ltd | Improvements in apparatus for filtering gases or liquids |
| US2605904A (en) * | 1949-04-04 | 1952-08-05 | Engine Life Products Corp | Oil filter |
| US3164551A (en) * | 1960-08-02 | 1965-01-05 | Magnetic cleaner for fluids | |
| US3235085A (en) * | 1962-01-08 | 1966-02-15 | Wix Corp | Filter unit having dual purpose valve assembly |
| US3342332A (en) * | 1964-04-10 | 1967-09-19 | Marvel Eng Co | Filter |
| US3543935A (en) * | 1969-01-13 | 1970-12-01 | Robert P Detrick | Combination full flow,slow flow oil filter |
| US3794168A (en) * | 1972-07-31 | 1974-02-26 | Parker Hannifin Corp | Filter with condition indicator |
-
1975
- 1975-09-10 US US05/612,157 patent/US4053410A/en not_active Expired - Lifetime
-
1976
- 1976-04-20 GB GB15884/76A patent/GB1497851A/en not_active Expired
- 1976-04-21 CA CA250,663A patent/CA1063524A/en not_active Expired
- 1976-08-20 BE BE1007569A patent/BE845364A/en not_active IP Right Cessation
-
1983
- 1983-05-19 HK HK171/83A patent/HK17183A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1497851A (en) | 1978-01-12 |
| HK17183A (en) | 1983-05-27 |
| US4053410A (en) | 1977-10-11 |
| BE845364A (en) | 1977-02-21 |
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